US3625592A
Expired / Lapsed
US
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Electro-optical modulator
Assignee: Clevite Corp
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Filing: 1969-11-13
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Granted: 1971-12-07
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Expires: 1989-11-13
Abstract
Abstract An electro-optical modulator employing the linear electro-optic effect, also known as the Pockels effect, in potassium dihydrogen phosphate or other P-type crystal material has the optical faces of the crystal body cut at oblique angles to the optic axis. Electrodes are arranged so that when a potential difference is applied a component of the resulting field in the body is parallel to the optic axis. In a preferred form the optical faces are so oriented that a beam of light incident on one of the faces at Brewster''s angle passes through the body parallel to the optic axis. Reflections are eliminated when the incident beam is linearly polarized with the electric vector parallel to the plane of incidence, and the electric field in the body is zero.
Inventors
- 👤 James Donald Beasley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:27
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; Y; Y10; Y10S; Y10S65/00; Y10S65/08
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
111 words
A body of P-type crystal material having a first pair of opposite surfaces, each surface of said pair forming an oblique angle with the z axis of the crystal material; and having a second pair of opposite surfaces, each surface of said second pair intersecting the surfaces of said first pair; and two electrodes, each attached to a different one of said opposite surfaces of said second pair; the orientation of the surfaces of said second pair being such that when a potential difference is applied between the said two electrodes, a component of the resulting electric field within the body is parallel to the z axis of the crystal material.
Claim 2
Dependent Claim
111 words
A body of P-type crystal material having a first pair of opposite surfaces, each surface of said pair forming an oblique angle with the z axis of the crystal material; and having a second pair of opposite surfaces, each surface of said second pair intersecting the surfaces of said first pair; and two electrodes, each attached to a different one of said opposite surfaces of said second pair; the orientation of the surfaces of said second pair being such that when a potential difference is applied between the said two electrodes, a component of the resulting electric field within the body is parallel to the z axis of the crystal material.
Claim 3
Dependent Claim
24 words
A body of P-type crystal material as described in claim 1 in which the surfaces of said first pair of surfaces are substantially parallel.
Claim 4
Dependent Claim
35 words
A body of P-type crystal material as described in claim 2 in which the surfaces of said first pair of surfaces are substantially parallel to the x or (y ) axis of the crystal material.
Claim 5
Dependent Claim
61 words
A body of P-type crystal material as described in claim 3 in which an intersection of a surface of said first pair of surfaces wIth a surface of said second pair of surfaces is truncated by a surface which is substantially parallel to the plane defined by the z axis and the x or (y ) axis of the crystal material.
Claim 6
Dependent Claim
35 words
A body of P-type crystal material as described in claim 2 in which the surfaces of said first pair of surfaces form substantially equal angles with the x and y axes of the crystal material.
Claim 7
Dependent Claim
28 words
A body of P-type crystal material as described in claim 1 in which the P-type crystal material is K(H1 xDx)2PO4 with x having a value greater than 0.8.
Claim 8
Dependent Claim
54 words
A body of P-type crystal material as described in claim 2 for use within a vacuum or within a fluid having an index of refraction of 1.0 in which the oblique angle between said first pair of surfaces and the z axis of the crystal material is in the range of 56.4* to 59.3*.
Claim 9
Dependent Claim
53 words
A body of P-type crystal material as described in claim 2 for use within a fluid having an index of refraction in the range 1.26- 1.30 in which the oblique angle between said first pair of surfaces and the z axis of the crystal material is in the range of 49* to 53*.
Claim 10
Dependent Claim
57 words
A body of P-type crystal material as described in claim 2 in which the P-type crystal material is K(H1 x Dx)2PO4 with x having a value greater than 0.8 and in which the oblique angle between said first pair of surfaces and the z axis of the crystal material is in the range of 56.4* to 56.8*.
Claim 11
Dependent Claim
99 words
An electro-optical device for modulating a beam of polarized light comprising: a body of P-type crystal material having a first pair of opposite surfaces, each surface of the pair forming an oblique angle with the z axis of the crystal material, said body being positioned and oriented so that the beam is incident on one of said first pair of surfaces and passes through the body substantially parallel to the z axis of the crystal; and means for applying an electric field to the body with a component of the field parallel to the z axis of the crystal.
Claim 12
Dependent Claim
99 words
An electro-optical device for modulating a beam of polarized light comprising: a body of P-type crystal material having a first pair of opposite surfaces, each surface of the pair forming an oblique angle with the z axis of the crystal material, said body being positioned and oriented so that the beam is incident on one of said first pair of surfaces and passes through the body substantially parallel to the z axis of the crystal; and means for applying an electric field to the body with a component of the field parallel to the z axis of the crystal.
Claim 13
Dependent Claim
24 words
An electro-optical device as described in claim 10 in which the plane of incidence is substantially parallel to the y or (x ) axis.
Claim 14
Dependent Claim
26 words
An electro-optical device as described in claim 10 in which the plane of incidence forms an angle of substantially 45* with the x and y axes.
Claim 15
Dependent Claim
18 words
An electro-optical device as described in claim 10 in which the angle of incidence is substantially Brewster''s angle.
Claim 16
Dependent Claim
23 words
An electro-optical device as described in claim 13 in which the plane of incidence is substantially parallel to the y or (x) axis.
Claim 17
Dependent Claim
26 words
An electro-optical device as described in claim 13 in which the plane of incidence forms an angle of substantially 45* with the x and y axes.
Claim 18
Dependent Claim
56 words
An electro-optical device as described in claim 13 in which the means for applying an electric field comprise two electrodes, each supported in close proximity to a different one of said opposite surfaces of said first pair of surfaces, and each electrode has an aperture through which the beam of light enters and leaves the device.
Claim 19
Dependent Claim
64 words
An electro-optical device as described in claim 10 in which the body of crystal material has a second pair of opposite surfaces, each surface of the second pair intersecting said first pair of surfaces and the means for applying an electric field comprise two electrodes, each supported in close proximity to a different one of said opposite surfaces of said second pair of surfaces.
Claim 20
Dependent Claim
119 words
An electro-optical device for modulating a beam of polarized light comprising: a body of P-type crystal material having first, second, and third pairs of substantially parallel faces forming a substantially rectangular parallelpiped, said body being positioned and oriented so that: a. the beam oF light is incident on one face of said first pair of faces substantially at Brewster ''s angle; b. the said first pair of faces form an angle with the z axis of the crystal material which numerically is substantially equal to Brewster''s angle; c. the second pair of faces are substantially parallel to the z axis of the crystal material; and electrodes supported in close proximity to the faces of said third pair of faces.
Claim 21
Dependent Claim
119 words
An electro-optical device for modulating a beam of polarized light comprising: a body of P-type crystal material having first, second, and third pairs of substantially parallel faces forming a substantially rectangular parallelpiped, said body being positioned and oriented so that: a. the beam oF light is incident on one face of said first pair of faces substantially at Brewster ''s angle; b. the said first pair of faces form an angle with the z axis of the crystal material which numerically is substantially equal to Brewster''s angle; c. the second pair of faces are substantially parallel to the z axis of the crystal material; and electrodes supported in close proximity to the faces of said third pair of faces.
Claim 22
Dependent Claim
29 words
An electro-optical device as described in claim 18 in which the said third pair of faces are substantially parallel to the x or (y) axis of the crystal material.
Claim 23
Dependent Claim
23 words
An electro-optical device as described in claim 19 in which the P-type crystal material is K(H1 xDx)2PO4 and x is greater than 0.8.
Claim 24
Dependent Claim
30 words
An electro-optical device as described in claim 18 in which the said first pair of faces form substantially equal angles with the x and y axes of the crystal material.
Claim 25
Dependent Claim
23 words
An electro-optical device as described in claim 21 in which the P-type crystal material is K(H1 xDx)2PO4 and x is greater than 0.8.
References Cited (Backward Citations)
US3402002A
Cited
US3495892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |